APA (7th ed.) Citation

Sharpstone, D. C. (1931). Method of illustrating the magnification of photomicrographs. Economic Geology & the Bulletin of the Society of Economic Geologists, 26, 777. https://doi.org/10.2113/gsecongeo.26.7.777

Chicago Style (17th ed.) Citation

Sharpstone, D. C. "Method of Illustrating the Magnification of Photomicrographs." Economic Geology & the Bulletin of the Society of Economic Geologists 26 (1931): 777. https://doi.org/10.2113/gsecongeo.26.7.777.

MLA (9th ed.) Citation

Sharpstone, D. C. "Method of Illustrating the Magnification of Photomicrographs." Economic Geology & the Bulletin of the Society of Economic Geologists, vol. 26, 1931, p. 777, https://doi.org/10.2113/gsecongeo.26.7.777.